Pole-changer.



PATENTED OCT. l5, 1907.

11. MULEAN. PoLB CHANGER. APPLICATION FILED KAB.. 14, 1906.

INVENTOR ATTORNEY UNITED STATES EWING MCLEAN, OF GREENCASTLE, INDIANA.

POLE-CHANGER.

Specification of Letters Patent.

Patented Oct. 15, 1907.

Application filed March 14,1906. Serial No. 306,076.

To all whom it may concern.'

` Be it known that I, EWING MCLEAN, a citizen of the United States, residing at Greencastle, iri the county of Putnam and State of Indiana, have invented certain new and useful Improvements in Pole-Changers, of which the following is a specification, reference being had therein to the accompanying drawing.

i This invention relates to mechanism for changing o alternating the polarity of an electric current and is particularly' adapted for use in telephone exchanges in connection with the polarized bells thereof, as will be hereinafter more fully set forth and pointed out in the claims. 'I i The object of this invention is to provide a simple, cheap and durable device whereby alternating and pulsating currents may be provided, the current being derived from any suitable battery, series of batteries or other service or direct current'supply, whereby to ring polarized bells connected to telephone lines.

A further object is to provide a separate means, oper-V ated independently of the alternating and pulsating mechanism, whereby said alternating and pulsating mechanism may be operated continuously and uninterruptedly.

vI attain these objects by means of the mechanism illustrated in the accompanying drawings in which 'similar numerals of reference designate like parts base-plate preferably of insulating material upon and to which the apparatus is secured. The vibratory arm 2, whereby the pole changer is operated, is preferably constructed of a non-conducting or insulating material such as fiber, hard rubber, or other such material, and said vibratory arm is hingedly mounted at its pivotal ond on the post 3, and at its vibratory end or enlarged end situated between and in contact with the contacting retractive` springs 5 and 6 to rapidly vibrate the latter.

Near the hinged or pivotal portion of the arm 2 is secured a contact spring 7 which is adapted to contact with the contact point of the set-screw 8 supported'by the post 9, and by means of said screw 8 the distance of the contact point thereof from the contact spring 7 is varied and adjusted. The post 9 is connected to one pole of a closed battery circuit l0 which battery may be of any approved form of construction', by a conducting wire ll. The electric magnet is situated on that side of the vibratory ann 2 opposed to lthe adjusting-screw 8, and said magnet 12 is connected to the other pole of the battery "l0 by means of a conducLln'g-wire 13. The magnet Bis secured to and supported by its post 14, and :nid magnet is electrically connected to the hingepost`3 of the vibratory arm 2 by a suitable conductingwire l5. The armature 1G is secured on the vibratory arm 2 in position thereon to be situated directly opposite the magnet l2. A tension-spring 2 is connected at one of its ends to the arm 2 at a point intermediate the hinged and vibratory ends thereof, and at its other end to the adjusting screw 2b which latter is screwed into the head of the supporting-post 2c secured to the base-1.

`From the foregoing it will be readily seen that the mechanism for vibrating the vibratory arm 2 comprises a construction similar to the ordinary and well known circuit breaker'.

The battery or batteries 17, for supplying the current to ring the telephone bells, may be of any suitable and approved construction, either primary, secondary or other suitable and convenient source, for supplyingor generating electric current. Extending from onepole of this battery, say, for instance, the positive pole, is a conductingwire 18 which is connected to the positive intermediate vibratory or retractivelspring 6, and from the negative pole of said battery extends the conducting-wire 19 which is connected to the negative intermediate vibratory or retractive spring 5. The vibratory or retractive springs 5 and 6 are secured at their ends to the top side portions of their supporting post 20, and between the bearing sides of said post 20 and the retractive springs 5 and 6 are suitable insulating-strips 2l and 22. The intermediate retractive springs extend edgewise and horizontally'to slightlylap 'over the vibrating end of the vibratory arm 2, so that their resilient ends Contact with the sides of the enlarged vibrating end 4 of said vibratory arm as previously stated.

Situated between the intermediate retractive springs 5 and 6 at a point intermediate the fixed and vibrating ends thereof, is a post 23 the supporting foot 24 of which is secured to the base l. On the opposite sides of the top or head of said post are the contact points 25 and 26, with'which the contact points 27 and 28, situated on the inner sides of the intermediate retractive springs 5 and 6, are alternately caused to contact.

Secured at their-ends to the post 22 and situnted'exy teriorly of the intermediate retractive springs 5 and 6 are the outer retractive springs 29 and 30 which are insulated from said intermediate retractive springs by the separating insulating liners 31 and 32, and said outer retractive springs extend horizontally and parallel to the sides of said intermediate refractive springs and have their vibrating ends bent outwardly which outwardly extending ends or bends are hooked or bent slightly beyond the sides of the retractive spring arms 5 and and directly opposite to the outer contacting flowing along the wire 37 and during which instant of of the contact pin 2 8 to contact with the Contact point and will move toward the post 23 by itsown resiliency :36' will lie-negative and the wire'B positive, and the and `when the current flows through the wires37 and' -the'letters A alternating, P. P positive pulsating ends of said contact pins 27 and 28 are the contact points 34 and 25 which are secured on the inner sides of the outer retractive spring arms 29 and 30,'so that when the arm 2 is swung in the direction of the arrow a the intermediate retractive spring arm 5 will'be moved in the same direction to cause the outer contacting end 35 of theretractive spring arm 30, thereby making a circuit with the wire 19 and the wire 35, that is a negative current. At this same instant the vibrating end of the intermediate retractive spring arm- 6 is released to cause its inner contacting point of its contacting pin 27 to Contact with.the contact point oi the pin 26 on the post 23 thereby connecting the positive. wire 18 with the service wire oralternating current conducting wire 37; thus for the instant a 'positive current is time the wire 38 is dead or is not connected to' anyV pole of the battery or soiirce of electricity. Now suppose Athe vibratoryarm 2 making its Areturn vibration or is moving in the direction *of the arrow b, then the intermediate retractive spring arm 6 will be moved in the same 'direction to cause the outer contacting point of the contacting pin 27 to contact with the contact point 34' of the outer retractiv spring arm 29, thereby making the circuit between the wire' 18, connected to'the positive pole of the battery 1 7,` and the service wie 38. At this same instant of time the vibrating end of the intermediate retractive spring arm zbeing released will move toward the-post 23 by its own resiliency'to cause .theinn'er contacting point of its contact pi'n 28 to contact with the contact point of the pin 25 on said post 23, thereby connecting the negative pole ofthe battery 17 with the alternate service wire 37; thus for the instant a positive current is flowing through the 4service wire 38 `while a negative current is flowing-through the service wire 37, during i which instant of time the service wire 36' is dead or its connection with the battery is broken. wilibe readily' understoodfrom the above description' and -a reference tothe drawings that-theservice wie 37`will alternate, positiveandvnegative, and the -wire currents in all three wires will'be pulsating. It is also clear that the current flowing throughl the Vwires 36 and 37 willbe respectively negative and' positive;

38, the wir'eulvwill be negative while the wire 38 will be positive; and tl'ius'l by a proper system of 'wiring as shown in Fig; l. .ofthe drawin'gs and designated by y N. Pznegati've pulsating,` and of said-arms and said 'ou-ter resilient retracti've currents may .be 'produced by this inachine. 1

It' is to be understood thatthe alternating, positive pulsating,

foregoing described andV negative pulsating currents are'to b'e takenoff and -used serially or intermittently, rather thancontemporaneously.' "In orderto obtain an alternating current itis-.necessatyto con: n ect the translating device ori devices iunseries-one side to the center wire, the other side'to both thev upper i alternate .positive and ses,576

tive and negative polarity, the combinatlonvwlth aisourcev of direct electric current, a retractlve` spring arms, a'retractlve arm supportingp'ost whereto `one end ot each I secured, and acontact post situated between th'e free ends o t said reti-active spring ot said retractlye spring arms valternately to relieve alternate positive and negative currents oi' electricity, of af horizontally extending -vibratory arm having a vibrating vend 'o1' an insulating material, sa'id armv oppositely disposed relatively to said retractive arms and having its lnsulated vibrating end situated between "the vibrating ends. of said retractive spring arms, opposing contact pointsfjo'uand on said Vretractive arms and in'v dependently.electrically operated nieans for vibratlngsiiidj each side of said'. post vibrator-y arm.

2. In a pole changer for transferring direct constant,

currents of electricityv rents of 'positive and with a regular source intermediate` resilient retractive spring arms, a pair of outer resilient into alternating' and pulsating' curtractive spring arms are fxedly secured, each at one of its pair ot horizontally extending;

of said spring armsv is. xedly' negative quality, the .combinationof direct electric current, a pairof longitudinally extending." retractige sp1-lng' arms situated in parallel relation tosaid-intermediatere" tractive spring arms, a supporting post whereto ssidre-V arms to be incontact-wlth eachl v 4' ends. and suitable' insulating liners situated between eachof said'retractive lspi-ing arms and said post a're insulated,

situated between the free endl of said receive alternate positlveLand negative currents, means the source ofy electricity and meansl for outer retrsctivespring arms with the service-lines...

post whereby each'` oi.' a contact post intermediate re"- tractive spring arlms in position 'to -be in 'contact withl each oi said intermediate retraetlve spring arms alternately to' X for connecting said retra'ctlve spring amssto -the polesofconnecting said 3. In ajpolechanger tortransferring `direct lconstant- `currentsI 'int'a'itelnating and pulsating 'currents of positive and negatiyequality, the combination lwith aJsource of direct 'electric current,'a pair ofiinter'mediate resilient retractive horizontally extending` spring arms,-a pair of' spring.'l arrnssltuated in paraill'. 'relation' to said intermediate retrae'tive spring-arms, out-1 wai-diy extending. s topvarmsor bends'on the vibrating ends,

or' said outer retractivefspring'arms andfouter'retractive spring'ar'm stops,a supportlngpost whereto said retractiveeschat'one'ot its ends, and suit spring arms are secured, able insulating liners situated between each ofsaid retractive spring arms and saidfsupprting post,` ot. a contact post' situated ,between lsaid intermediate reti-active spring arms in positiony to. be` in contact with each of said .inter-mediate'retractivespring arms alternately to, receive negative currents, means forjconf necting said retractive' springer-ms .to the poles of `the source of electricity' and i retractive'sprlng arms with the service lines.

`Intestilnony whereof I ailix my slgnatur'e'in presence of means for connecting lsaid outer'- 

